39497731 has 16 divisors (see below), whose sum is σ = 48841408. Its totient is φ = 31104000.

The previous prime is 39497729. The next prime is 39497737. The reversal of 39497731 is 13779493.

It is a 10-Lehmer number, since φ(39497731) divides (39497731-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 39497731 - 2¹ = 39497729 is a prime.

It is a super-2 number, since 2×39497731² = 3120141508296722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39497737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21031 + ... + 22831.

It is an arithmetic number, because the mean of its divisors is an integer number (3052588).

Almost surely, 2^39497731 is an apocalyptic number.

39497731 is a deficient number, since it is larger than the sum of its proper divisors (9343677).

39497731 is a wasteful number, since it uses less digits than its factorization.

39497731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062.

The product of its digits is 142884, while the sum is 43.

The square root of 39497731 is about 6284.7220304481. The cubic root of 39497731 is about 340.5577092449.

The spelling of 39497731 in words is "thirty-nine million, four hundred ninety-seven thousand, seven hundred thirty-one".