1021493908 has 6 divisors (see below), whose sum is σ = 1787614346. Its totient is φ = 510746952.

The previous prime is 1021493899. The next prime is 1021493959. The reversal of 1021493908 is 8093941201.

It can be written as a sum of positive squares in only one way, i.e., 608510224 + 412983684 = 24668^2 + 20322^2 .

It is a super-2 number, since 2×1021493908² = 2086899608162224928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127686735 + ... + 127686742.

Almost surely, 2^1021493908 is an apocalyptic number.

It is an amenable number.

1021493908 is a deficient number, since it is larger than the sum of its proper divisors (766120438).

1021493908 is a wasteful number, since it uses less digits than its factorization.

1021493908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255373481 (or 255373479 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1021493908 is about 31960.8183249428. The cubic root of 1021493908 is about 1007.1139083025.

The spelling of 1021493908 in words is "one billion, twenty-one million, four hundred ninety-three thousand, nine hundred eight".