290138731 has 8 divisors (see below), whose sum is σ = 296352000. Its totient is φ = 283984680.

The previous prime is 290138729. The next prime is 290138749. The reversal of 290138731 is 137831092.

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 290138731 - 2¹ = 290138729 is a prime.

It is a super-2 number, since 2×290138731² = 168360966452580722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290138791) 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, 4831 + ... + 24568.

It is an arithmetic number, because the mean of its divisors is an integer number (37044000).

Almost surely, 2^290138731 is an apocalyptic number.

290138731 is a deficient number, since it is larger than the sum of its proper divisors (6213269).

290138731 is a wasteful number, since it uses less digits than its factorization.

290138731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29609.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 290138731 is about 17033.4591613095. The cubic root of 290138731 is about 662.0161268483.

The spelling of 290138731 in words is "two hundred ninety million, one hundred thirty-eight thousand, seven hundred thirty-one".