1401821264 has 20 divisors (see below), whose sum is σ = 2735858004. Its totient is φ = 695793408.

The previous prime is 1401821261. The next prime is 1401821293. The reversal of 1401821264 is 4621281041.

It can be written as a sum of positive squares in 2 ways, for example, as 557337664 + 844483600 = 23608^2 + 29060^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401821261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317567 + ... + 321950.

Almost surely, 2^1401821264 is an apocalyptic number.

It is an amenable number.

1401821264 is a deficient number, since it is larger than the sum of its proper divisors (1334036740).

1401821264 is a wasteful number, since it uses less digits than its factorization.

1401821264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639662 (or 639656 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 1401821264 is about 37440.9036215741. The cubic root of 1401821264 is about 1119.1738337568.

The spelling of 1401821264 in words is "one billion, four hundred one million, eight hundred twenty-one thousand, two hundred sixty-four".