290891397 has 4 divisors (see below), whose sum is σ = 387855200. Its totient is φ = 193927596.

The previous prime is 290891353. The next prime is 290891399. The reversal of 290891397 is 793198092.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 290891397 - 2⁶ = 290891333 is a prime.

It is a super-2 number, since 2×290891397² = 169235609697223218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290891399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48481897 + ... + 48481902.

It is an arithmetic number, because the mean of its divisors is an integer number (96963800).

Almost surely, 2^290891397 is an apocalyptic number.

It is an amenable number.

290891397 is a deficient number, since it is larger than the sum of its proper divisors (96963803).

290891397 is an equidigital number, since it uses as much as digits as its factorization.

290891397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96963802.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 290891397 is about 17055.5386018736. The cubic root of 290891397 is about 662.5880909088.

The spelling of 290891397 in words is "two hundred ninety million, eight hundred ninety-one thousand, three hundred ninety-seven".