1401661604 has 24 divisors (see below), whose sum is σ = 2812907328. Its totient is φ = 598658400.

The previous prime is 1401661603. The next prime is 1401661609. The reversal of 1401661604 is 4061661041.

It is not an unprimeable number, because it can be changed into a prime (1401661603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77222 + ... + 93629.

It is an arithmetic number, because the mean of its divisors is an integer number (117204472).

Almost surely, 2^1401661604 is an apocalyptic number.

1401661604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1401661604 is an abundant number, since it is smaller than the sum of its proper divisors (1411245724).

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

1401661604 is a wasteful number, since it uses less digits than its factorization.

1401661604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171155 (or 171153 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1401661604 is about 37438.7714007818. The cubic root of 1401661604 is about 1119.1313428242.

The spelling of 1401661604 in words is "one billion, four hundred one million, six hundred sixty-one thousand, six hundred four".