290138631 has 8 divisors (see below), whose sum is σ = 393193584. Its totient is φ = 190254720.

The previous prime is 290138623. The next prime is 290138657. The reversal of 290138631 is 136831092.

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

It is not a de Polignac number, because 290138631 - 2³ = 290138623 is a prime.

It is a super-2 number, since 2×290138631² = 168360850397108322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 290138592 and 290138601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290138671) 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, 792546 + ... + 792911.

It is an arithmetic number, because the mean of its divisors is an integer number (49149198).

Almost surely, 2^290138631 is an apocalyptic number.

290138631 is a deficient number, since it is larger than the sum of its proper divisors (103054953).

290138631 is a wasteful number, since it uses less digits than its factorization.

290138631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585521.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 290138631 is about 17033.4562259102. The cubic root of 290138631 is about 662.0160507908.

The spelling of 290138631 in words is "two hundred ninety million, one hundred thirty-eight thousand, six hundred thirty-one".