39402240 has 144 divisors (see below), whose sum is σ = 130292736. Its totient is φ = 10137600.

The previous prime is 39402229. The next prime is 39402241. The reversal of 39402240 is 4220493.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 39402240.

It is not an unprimeable number, because it can be changed into a prime (39402241) 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, 118875 + ... + 119205.

Almost surely, 2^39402240 is an apocalyptic number.

39402240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65146368).

39402240 is an abundant number, since it is smaller than the sum of its proper divisors (90890496).

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

39402240 is a wasteful number, since it uses less digits than its factorization.

39402240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 39402240 is about 6277.1203588907. The cubic root of 39402240 is about 340.2830399754.

The spelling of 39402240 in words is "thirty-nine million, four hundred two thousand, two hundred forty".