39975390 has 128 divisors (see below), whose sum is σ = 131281920. Its totient is φ = 8429184.

The previous prime is 39975371. The next prime is 39975401. The reversal of 39975390 is 9357993.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23757 + ... + 25383.

It is an arithmetic number, because the mean of its divisors is an integer number (1025640).

Almost surely, 2^39975390 is an apocalyptic number.

39975390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 39975390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65640960).

39975390 is an abundant number, since it is smaller than the sum of its proper divisors (91306530).

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

39975390 is a wasteful number, since it uses less digits than its factorization.

39975390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 229635, while the sum is 45.

The square root of 39975390 is about 6322.6094296580. The cubic root of 39975390 is about 341.9250374330.

The spelling of 39975390 in words is "thirty-nine million, nine hundred seventy-five thousand, three hundred ninety".