39117990 has 16 divisors (see below), whose sum is σ = 93883248. Its totient is φ = 10431456.

The previous prime is 39117989. The next prime is 39117997. The reversal of 39117990 is 9971193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39117997) 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, 651937 + ... + 651996.

It is an arithmetic number, because the mean of its divisors is an integer number (5867703).

Almost surely, 2^39117990 is an apocalyptic number.

39117990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

39117990 is an abundant number, since it is smaller than the sum of its proper divisors (54765258).

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

39117990 is a wasteful number, since it uses less digits than its factorization.

39117990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303943.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 39117990 is about 6254.4376245990. The cubic root of 39117990 is about 339.4627906264.

It can be divided in two parts, 391 and 17990, that added together give a palindrome (18381).

The spelling of 39117990 in words is "thirty-nine million, one hundred seventeen thousand, nine hundred ninety".