397259540 has 12 divisors (see below), whose sum is σ = 834245076. Its totient is φ = 158903808.

The previous prime is 397259531. The next prime is 397259561. The reversal of 397259540 is 45952793.

It can be written as a sum of positive squares in 2 ways, for example, as 153462544 + 243796996 = 12388^2 + 15614^2 .

It is a junction number, because it is equal to n+sod(n) for n = 397259491 and 397259500.

It is a congruent number.

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, 9931469 + ... + 9931508.

It is an arithmetic number, because the mean of its divisors is an integer number (69520423).

Almost surely, 2^397259540 is an apocalyptic number.

It is an amenable number.

397259540 is an abundant number, since it is smaller than the sum of its proper divisors (436985536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397259540 is a wasteful number, since it uses less digits than its factorization.

397259540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19862986 (or 19862984 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 397259540 is about 19931.3707506534. The cubic root of 397259540 is about 735.1197854966.

The spelling of 397259540 in words is "three hundred ninety-seven million, two hundred fifty-nine thousand, five hundred forty".