836904381 has 16 divisors (see below), whose sum is σ = 1225674240. Its totient is φ = 505589040.

The previous prime is 836904377. The next prime is 836904391. The reversal of 836904381 is 183409638.

It is a happy number.

It is not a de Polignac number, because 836904381 - 2² = 836904377 is a prime.

It is a super-2 number, since 2×836904381² = 1400817885873986322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (836904311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317875 + ... + 320496.

It is an arithmetic number, because the mean of its divisors is an integer number (76604640).

Almost surely, 2^836904381 is an apocalyptic number.

It is an amenable number.

836904381 is a deficient number, since it is larger than the sum of its proper divisors (388769859).

836904381 is a wasteful number, since it uses less digits than its factorization.

836904381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638416.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 836904381 is about 28929.2996977113. The cubic root of 836904381 is about 942.3783071731.

The spelling of 836904381 in words is "eight hundred thirty-six million, nine hundred four thousand, three hundred eighty-one".