390211940 has 12 divisors (see below), whose sum is σ = 819445116. Its totient is φ = 156084768.

The previous prime is 390211933. The next prime is 390211993. The reversal of 390211940 is 49112093.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 156550144 + 233661796 = 12512^2 + 15286^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9755279 + ... + 9755318.

It is an arithmetic number, because the mean of its divisors is an integer number (68287093).

Almost surely, 2^390211940 is an apocalyptic number.

It is an amenable number.

390211940 is an abundant number, since it is smaller than the sum of its proper divisors (429233176).

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

390211940 is a wasteful number, since it uses less digits than its factorization.

390211940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19510606 (or 19510604 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 390211940 is about 19753.7829288468. The cubic root of 390211940 is about 730.7466807957.

The spelling of 390211940 in words is "three hundred ninety million, two hundred eleven thousand, nine hundred forty".