397940399 has 8 divisors (see below), whose sum is σ = 408192960. Its totient is φ = 387762336.

The previous prime is 397940363. The next prime is 397940401. The reversal of 397940399 is 993049793.

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 397940399 - 2¹² = 397936303 is a prime.

It is a super-2 number, since 2×397940399² = 316713122312558402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397940399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397940999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7724 + ... + 29249.

It is an arithmetic number, because the mean of its divisors is an integer number (51024120).

Almost surely, 2^397940399 is an apocalyptic number.

397940399 is a deficient number, since it is larger than the sum of its proper divisors (10252561).

397940399 is a wasteful number, since it uses less digits than its factorization.

397940399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37249.

The product of its (nonzero) digits is 1653372, while the sum is 53.

The square root of 397940399 is about 19948.4435232426. The cubic root of 397940399 is about 735.5395171853.

The spelling of 397940399 in words is "three hundred ninety-seven million, nine hundred forty thousand, three hundred ninety-nine".