396991537 has 8 divisors (see below), whose sum is σ = 408085952. Its totient is φ = 385916400.

The previous prime is 396991481. The next prime is 396991541. The reversal of 396991537 is 735199693.

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

It is a cyclic number.

It is not a de Polignac number, because 396991537 - 2⁷ = 396991409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396991547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43612 + ... + 51922.

It is an arithmetic number, because the mean of its divisors is an integer number (51010744).

Almost surely, 2^396991537 is an apocalyptic number.

396991537 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

396991537 is the 11504-th hex number.

It is an amenable number.

396991537 is a deficient number, since it is larger than the sum of its proper divisors (11094415).

396991537 is a wasteful number, since it uses less digits than its factorization.

396991537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9639.

The product of its digits is 1377810, while the sum is 52.

The square root of 396991537 is about 19924.6464711422. The cubic root of 396991537 is about 734.9544371466.

The spelling of 396991537 in words is "three hundred ninety-six million, nine hundred ninety-one thousand, five hundred thirty-seven".