397902405 has 8 divisors (see below), whose sum is σ = 636643872. Its totient is φ = 212214608.

The previous prime is 397902353. The next prime is 397902409. The reversal of 397902405 is 504209793.

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 397902405 - 2⁸ = 397902149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397902409) 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, 13263399 + ... + 13263428.

It is an arithmetic number, because the mean of its divisors is an integer number (79580484).

Almost surely, 2^397902405 is an apocalyptic number.

It is an amenable number.

397902405 is a deficient number, since it is larger than the sum of its proper divisors (238741467).

397902405 is a wasteful number, since it uses less digits than its factorization.

397902405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26526835.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 397902405 is about 19947.4911956366. The cubic root of 397902405 is about 735.5161075005.

It can be divided in two parts, 39790 and 2405, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 397902405 in words is "three hundred ninety-seven million, nine hundred two thousand, four hundred five".