390852981 has 12 divisors (see below), whose sum is σ = 584033580. Its totient is φ = 251583360.

The previous prime is 390852953. The next prime is 390853013. The reversal of 390852981 is 189258093.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 204776100 + 186076881 = 14310^2 + 13641^2 .

It is not a de Polignac number, because 390852981 - 2⁷ = 390852853 is a prime.

It is a super-2 number, since 2×390852981² = 305532105513172722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390852911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 748500 + ... + 749021.

It is an arithmetic number, because the mean of its divisors is an integer number (48669465).

Almost surely, 2^390852981 is an apocalyptic number.

It is an amenable number.

390852981 is a deficient number, since it is larger than the sum of its proper divisors (193180599).

390852981 is a wasteful number, since it uses less digits than its factorization.

390852981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497556 (or 1497553 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 390852981 is about 19770.0020485583. The cubic root of 390852981 is about 731.1466192664.

It can be divided in two parts, 3908529 and 81, that multiplied together give a square (316590849 = 17793²).

The spelling of 390852981 in words is "three hundred ninety million, eight hundred fifty-two thousand, nine hundred eighty-one".