997926907 has 2 divisors, whose sum is σ = 997926908. Its totient is φ = 997926906.

The previous prime is 997926901. The next prime is 997926931. The reversal of 997926907 is 709629799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997926907 - 2²³ = 989538299 is a prime.

It is a super-2 number, since 2×997926907² = 1991716223429173298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (997926901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498963453 + 498963454.

It is an arithmetic number, because the mean of its divisors is an integer number (498963454).

Almost surely, 2^997926907 is an apocalyptic number.

997926907 is a deficient number, since it is larger than the sum of its proper divisors (1).

997926907 is an equidigital number, since it uses as much as digits as its factorization.

997926907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3857868, while the sum is 58.

The square root of 997926907 is about 31589.9811174366. The cubic root of 997926907 is about 999.3084909254.

The spelling of 997926907 in words is "nine hundred ninety-seven million, nine hundred twenty-six thousand, nine hundred seven".