39971457 has 12 divisors (see below), whose sum is σ = 58309524. Its totient is φ = 26383200.

The previous prime is 39971453. The next prime is 39971473. The reversal of 39971457 is 75417993.

It can be written as a sum of positive squares in 2 ways, for example, as 30735936 + 9235521 = 5544^2 + 3039^2 .

It is not a de Polignac number, because 39971457 - 2² = 39971453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39971453) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 21078 + ... + 22895.

It is an arithmetic number, because the mean of its divisors is an integer number (4859127).

Almost surely, 2^39971457 is an apocalyptic number.

It is an amenable number.

39971457 is a deficient number, since it is larger than the sum of its proper divisors (18338067).

39971457 is a wasteful number, since it uses less digits than its factorization.

39971457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44080 (or 44077 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 39971457 is about 6322.2983953622. The cubic root of 39971457 is about 341.9138235730.

The spelling of 39971457 in words is "thirty-nine million, nine hundred seventy-one thousand, four hundred fifty-seven".