396432981 has 48 divisors (see below), whose sum is σ = 692025600. Its totient is φ = 223606656.

The previous prime is 396432943. The next prime is 396433003. The reversal of 396432981 is 189234693.

It is a happy number.

It is not a de Polignac number, because 396432981 - 2¹⁰ = 396431957 is a prime.

It is a super-2 number, since 2×396432981² = 314318216849092722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396432901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102621 + ... + 106413.

It is an arithmetic number, because the mean of its divisors is an integer number (14417200).

Almost surely, 2^396432981 is an apocalyptic number.

It is an amenable number.

396432981 is a deficient number, since it is larger than the sum of its proper divisors (295592619).

396432981 is a wasteful number, since it uses less digits than its factorization.

396432981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895 (or 3882 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 396432981 is about 19910.6248269611. The cubic root of 396432981 is about 734.6095885795.

It can be divided in two parts, 39643 and 2981, that added together give a palindrome (42624).

The spelling of 396432981 in words is "three hundred ninety-six million, four hundred thirty-two thousand, nine hundred eighty-one".