39699720 has 80 divisors (see below), whose sum is σ = 133446060. Its totient is φ = 10585728.

The previous prime is 39699713. The next prime is 39699727. The reversal of 39699720 is 2799693.

It is an interprime number because it is at equal distance from previous prime (39699713) and next prime (39699727).

It can be written as a sum of positive squares in 2 ways, for example, as 39463524 + 236196 = 6282^2 + 486^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (39699727) 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 19 ways as a sum of consecutive naturals, for example, 2887 + ... + 9366.

Almost surely, 2^39699720 is an apocalyptic number.

39699720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

39699720 is an abundant number, since it is smaller than the sum of its proper divisors (93746340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39699720 is a wasteful number, since it uses less digits than its factorization.

39699720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12276 (or 12263 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 39699720 is about 6300.7713813469. The cubic root of 39699720 is about 341.1372529355.

It can be divided in two parts, 3969 and 9720, that added together give a square (13689 = 117²).

The spelling of 39699720 in words is "thirty-nine million, six hundred ninety-nine thousand, seven hundred twenty".