40139900 has 36 divisors (see below), whose sum is σ = 88223520. Its totient is φ = 15849600.

The previous prime is 40139893. The next prime is 40139917. The reversal of 40139900 is 993104.

It is a happy number.

It is a super-2 number, since 2×40139900² = 3222423144020000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40139900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5360 + ... + 10440.

Almost surely, 2^40139900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40139900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44111760).

40139900 is an abundant number, since it is smaller than the sum of its proper divisors (48083620).

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

40139900 is a wasteful number, since it uses less digits than its factorization.

40139900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5174 (or 5167 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 40139900 is about 6335.6057326826. The cubic root of 40139900 is about 342.3934347993.

The spelling of 40139900 in words is "forty million, one hundred thirty-nine thousand, nine hundred".