397820842 has 8 divisors (see below), whose sum is σ = 631833156. Its totient is φ = 187209792.

The previous prime is 397820789. The next prime is 397820851. The reversal of 397820842 is 248028793.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 397244761 + 576081 = 19931^2 + 759^2 .

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

It is a super-2 number, since 2×397820842² = 316522844659177928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5850273 + ... + 5850340.

Almost surely, 2^397820842 is an apocalyptic number.

397820842 is a deficient number, since it is larger than the sum of its proper divisors (234012314).

397820842 is a wasteful number, since it uses less digits than its factorization.

397820842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11700632.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 397820842 is about 19945.4466482954. The cubic root of 397820842 is about 735.4658481077.

The spelling of 397820842 in words is "three hundred ninety-seven million, eight hundred twenty thousand, eight hundred forty-two".