397504890 has 48 divisors (see below), whose sum is σ = 1087912800. Its totient is φ = 100421856.

The previous prime is 397504879. The next prime is 397504901. The reversal of 397504890 is 98405793.

It is an interprime number because it is at equal distance from previous prime (397504879) and next prime (397504901).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 114520 + ... + 117939.

It is an arithmetic number, because the mean of its divisors is an integer number (22664850).

Almost surely, 2^397504890 is an apocalyptic number.

397504890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

397504890 is an abundant number, since it is smaller than the sum of its proper divisors (690407910).

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

397504890 is a wasteful number, since it uses less digits than its factorization.

397504890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232491 (or 232488 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 397504890 is about 19937.5246708311. The cubic root of 397504890 is about 735.2710925584.

The spelling of 397504890 in words is "three hundred ninety-seven million, five hundred four thousand, eight hundred ninety".