1401644000 has 48 divisors (see below), whose sum is σ = 3443849136. Its totient is φ = 560656000.

The previous prime is 1401643987. The next prime is 1401644021. The reversal of 1401644000 is 4461041.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171206 + ... + 179205.

It is an arithmetic number, because the mean of its divisors is an integer number (71746857).

Almost surely, 2^1401644000 is an apocalyptic number.

1401644000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401644000 is an abundant number, since it is smaller than the sum of its proper divisors (2042205136).

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

1401644000 is an equidigital number, since it uses as much as digits as its factorization.

1401644000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350436 (or 350418 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1401644000 is about 37438.5362961748. The cubic root of 1401644000 is about 1119.1266576062.

The spelling of 1401644000 in words is "one billion, four hundred one million, six hundred forty-four thousand".