40139371 has 2 divisors, whose sum is σ = 40139372. Its totient is φ = 40139370.

The previous prime is 40139357. The next prime is 40139417. The reversal of 40139371 is 17393104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40139371 - 2⁷ = 40139243 is a prime.

It is a super-2 number, since 2×40139371² = 3222338208551282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40139321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069685 + 20069686.

It is an arithmetic number, because the mean of its divisors is an integer number (20069686).

Almost surely, 2^40139371 is an apocalyptic number.

40139371 is a deficient number, since it is larger than the sum of its proper divisors (1).

40139371 is an equidigital number, since it uses as much as digits as its factorization.

40139371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 40139371 is about 6335.5639843663. The cubic root of 40139371 is about 342.3919306690.

The spelling of 40139371 in words is "forty million, one hundred thirty-nine thousand, three hundred seventy-one".