31400423142 has 64 divisors (see below), whose sum is σ = 69873269760. Its totient is φ = 9326304000.

The previous prime is 31400423141. The next prime is 31400423143. The reversal of 31400423142 is 24132400413.

It is an interprime number because it is at equal distance from previous prime (31400423141) and next prime (31400423143).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400423141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3945267 + ... + 3953217.

It is an arithmetic number, because the mean of its divisors is an integer number (1091769840).

Almost surely, 2^31400423142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31400423142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34936634880).

31400423142 is an abundant number, since it is smaller than the sum of its proper divisors (38472846618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31400423142 is a wasteful number, since it uses less digits than its factorization.

31400423142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9149.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31400423142 its reverse (24132400413), we get a palindrome (55532823555).

The spelling of 31400423142 in words is "thirty-one billion, four hundred million, four hundred twenty-three thousand, one hundred forty-two".