869457021 has 8 divisors (see below), whose sum is σ = 1165346304. Its totient is φ = 576602880.

The previous prime is 869457013. The next prime is 869457023. The reversal of 869457021 is 120754968.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 869457021 - 2³ = 869457013 is a prime.

It is a super-2 number, since 2×869457021² = 1511911022732388882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869457023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758116 + ... + 759261.

It is an arithmetic number, because the mean of its divisors is an integer number (145668288).

Almost surely, 2^869457021 is an apocalyptic number.

It is an amenable number.

869457021 is a deficient number, since it is larger than the sum of its proper divisors (295889283).

869457021 is a wasteful number, since it uses less digits than its factorization.

869457021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517571.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 869457021 is about 29486.5566148372. The cubic root of 869457021 is about 954.4416282182.

The spelling of 869457021 in words is "eight hundred sixty-nine million, four hundred fifty-seven thousand, twenty-one".