40399488 has 48 divisors (see below), whose sum is σ = 116257050. Its totient is φ = 13466112.

The previous prime is 40399487. The next prime is 40399501. The reversal of 40399488 is 88499304.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22353984 + 18045504 = 4728^2 + 4248^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (40399481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16383 + ... + 18686.

Almost surely, 2^40399488 is an apocalyptic number.

40399488 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

40399488 is an abundant number, since it is smaller than the sum of its proper divisors (75857562).

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

40399488 is a wasteful number, since it uses less digits than its factorization.

40399488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35089 (or 35074 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 40399488 is about 6356.0591564270. The cubic root of 40399488 is about 343.1299447863.

The spelling of 40399488 in words is "forty million, three hundred ninety-nine thousand, four hundred eighty-eight".