390609761 has 4 divisors (see below), whose sum is σ = 390996372. Its totient is φ = 390223152.

The previous prime is 390609701. The next prime is 390609763. The reversal of 390609761 is 167906093.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167906093 = 17 ⋅9876829.

It can be written as a sum of positive squares in 2 ways, for example, as 93702400 + 296907361 = 9680^2 + 17231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390609761 is a prime.

It is a super-3 number, since 3×390609761³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390609763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191786 + ... + 193811.

It is an arithmetic number, because the mean of its divisors is an integer number (97749093).

Almost surely, 2^390609761 is an apocalyptic number.

It is an amenable number.

390609761 is a deficient number, since it is larger than the sum of its proper divisors (386611).

390609761 is a wasteful number, since it uses less digits than its factorization.

390609761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386610.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 390609761 is about 19763.8498526982. The cubic root of 390609761 is about 730.9949284869.

The spelling of 390609761 in words is "three hundred ninety million, six hundred nine thousand, seven hundred sixty-one".