1401670656 has 264 divisors, whose sum is σ = 4327587264. Its totient is φ = 452874240.

The previous prime is 1401670651. The next prime is 1401670657. The reversal of 1401670656 is 6560761041.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1401670656.

It is not an unprimeable number, because it can be changed into a prime (1401670651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10699711 + ... + 10699841.

It is an arithmetic number, because the mean of its divisors is an integer number (16392376).

Almost surely, 2^1401670656 is an apocalyptic number.

1401670656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1401670656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2163793632).

1401670656 is an abundant number, since it is smaller than the sum of its proper divisors (2925916608).

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

1401670656 is an equidigital number, since it uses as much as digits as its factorization.

1401670656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1401670656 is about 37438.8922913058. The cubic root of 1401670656 is about 1119.1337519542.

The spelling of 1401670656 in words is "one billion, four hundred one million, six hundred seventy thousand, six hundred fifty-six".