39769981 has 8 divisors (see below), whose sum is σ = 40660704. Its totient is φ = 38884560.

The previous prime is 39769963. The next prime is 39769997. The reversal of 39769981 is 18996793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39769981 - 2⁵ = 39769949 is a prime.

It is a super-2 number, since 2×39769981² = 3163302777480722, 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 (39769901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16410 + ... + 18676.

It is an arithmetic number, because the mean of its divisors is an integer number (5082588).

Almost surely, 2^39769981 is an apocalyptic number.

It is an amenable number.

39769981 is a deficient number, since it is larger than the sum of its proper divisors (890723).

39769981 is a wasteful number, since it uses less digits than its factorization.

39769981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651.

The product of its digits is 734832, while the sum is 52.

The square root of 39769981 is about 6306.3445037518. The cubic root of 39769981 is about 341.3383838118.

The spelling of 39769981 in words is "thirty-nine million, seven hundred sixty-nine thousand, nine hundred eighty-one".