40139379 has 18 divisors (see below), whose sum is σ = 67445820. Its totient is φ = 22936536.

The previous prime is 40139371. The next prime is 40139417. The reversal of 40139379 is 97393104.

It is not a de Polignac number, because 40139379 - 2³ = 40139371 is a prime.

It is a super-2 number, since 2×40139379² = 3222339493011282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40139371) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45069 + ... + 45950.

It is an arithmetic number, because the mean of its divisors is an integer number (3746990).

Almost surely, 2^40139379 is an apocalyptic number.

40139379 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

40139379 is a deficient number, since it is larger than the sum of its proper divisors (27306441).

40139379 is a wasteful number, since it uses less digits than its factorization.

40139379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91039 (or 91029 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 40139379 is about 6335.5646157229. The cubic root of 40139379 is about 342.3919534158.

The spelling of 40139379 in words is "forty million, one hundred thirty-nine thousand, three hundred seventy-nine".