39472981 has 4 divisors (see below), whose sum is σ = 39498732. Its totient is φ = 39447232.

The previous prime is 39472967. The next prime is 39472987. The reversal of 39472981 is 18927493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11329956 + 28143025 = 3366^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 39472981 - 2⁵ = 39472949 is a prime.

It is a super-2 number, since 2×39472981² = 3116232458052722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39472987) 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, 10420 + ... + 13693.

It is an arithmetic number, because the mean of its divisors is an integer number (9874683).

Almost surely, 2^39472981 is an apocalyptic number.

It is an amenable number.

39472981 is a deficient number, since it is larger than the sum of its proper divisors (25751).

39472981 is a wasteful number, since it uses less digits than its factorization.

39472981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25750.

The product of its digits is 108864, while the sum is 43.

The square root of 39472981 is about 6282.7526610555. The cubic root of 39472981 is about 340.4865611540.

The spelling of 39472981 in words is "thirty-nine million, four hundred seventy-two thousand, nine hundred eighty-one".