390726740 has 24 divisors (see below), whose sum is σ = 826521192. Its totient is φ = 155148800.

The previous prime is 390726709. The next prime is 390726769. The reversal of 390726740 is 47627093.

It can be written as a sum of positive squares in 4 ways, for example, as 148986436 + 241740304 = 12206^2 + 15548^2 .

It is a junction number, because it is equal to n+sod(n) for n = 390726694 and 390726703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68561 + ... + 74040.

It is an arithmetic number, because the mean of its divisors is an integer number (34438383).

Almost surely, 2^390726740 is an apocalyptic number.

It is an amenable number.

390726740 is an abundant number, since it is smaller than the sum of its proper divisors (435794452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390726740 is a wasteful number, since it uses less digits than its factorization.

390726740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142747 (or 142745 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 390726740 is about 19766.8090495153. The cubic root of 390726740 is about 731.0678934846.

The spelling of 390726740 in words is "three hundred ninety million, seven hundred twenty-six thousand, seven hundred forty".