31025430 has 40 divisors (see below), whose sum is σ = 83426112. Its totient is φ = 8273232.

The previous prime is 31025429. The next prime is 31025441. The reversal of 31025430 is 3452013.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18342 + ... + 19961.

Almost surely, 2^31025430 is an apocalyptic number.

31025430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31025430 is an abundant number, since it is smaller than the sum of its proper divisors (52400682).

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

31025430 is a wasteful number, since it uses less digits than its factorization.

31025430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38322 (or 38313 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 31025430 is about 5570.0475760984. The cubic root of 31025430 is about 314.2239399446.

Adding to 31025430 its reverse (3452013), we get a palindrome (34477443).

The spelling of 31025430 in words is "thirty-one million, twenty-five thousand, four hundred thirty".