390629261 has 6 divisors (see below), whose sum is σ = 429369486. Its totient is φ = 355117400.

The previous prime is 390629249. The next prime is 390629279. The reversal of 390629261 is 162926093.

It can be written as a sum of positive squares in only one way, i.e., 195468361 + 195160900 = 13981^2 + 13970^2 .

It is not a de Polignac number, because 390629261 - 2¹⁴ = 390612877 is a prime.

It is a super-2 number, since 2×390629261² = 305182439098812242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390629201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1614050 + ... + 1614291.

It is an arithmetic number, because the mean of its divisors is an integer number (71561581).

Almost surely, 2^390629261 is an apocalyptic number.

It is an amenable number.

390629261 is a deficient number, since it is larger than the sum of its proper divisors (38740225).

390629261 is a wasteful number, since it uses less digits than its factorization.

390629261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228363 (or 3228352 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 390629261 is about 19764.3431714793. The cubic root of 390629261 is about 731.0070925147.

The spelling of 390629261 in words is "three hundred ninety million, six hundred twenty-nine thousand, two hundred sixty-one".