763900921 has 4 divisors (see below), whose sum is σ = 873029632. Its totient is φ = 654772212.

The previous prime is 763900901. The next prime is 763900931. The reversal of 763900921 is 129009367.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129009367 = 53 ⋅2434139.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-763900921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (763900901) 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, 54564345 + ... + 54564358.

It is an arithmetic number, because the mean of its divisors is an integer number (218257408).

Almost surely, 2^763900921 is an apocalyptic number.

It is an amenable number.

763900921 is a deficient number, since it is larger than the sum of its proper divisors (109128711).

763900921 is a wasteful number, since it uses less digits than its factorization.

763900921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109128710.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 763900921 is about 27638.7575878512. The cubic root of 763900921 is about 914.1392249295.

The spelling of 763900921 in words is "seven hundred sixty-three million, nine hundred thousand, nine hundred twenty-one".