40139381 has 8 divisors (see below), whose sum is σ = 42762720. Its totient is φ = 37567152.

The previous prime is 40139371. The next prime is 40139417. The reversal of 40139381 is 18393104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40139381 - 2¹⁸ = 39877237 is a prime.

It is a super-2 number, since 2×40139381² = 3222339814126322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40139321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11150 + ... + 14303.

It is an arithmetic number, because the mean of its divisors is an integer number (5345340).

Almost surely, 2^40139381 is an apocalyptic number.

It is an amenable number.

40139381 is a deficient number, since it is larger than the sum of its proper divisors (2623339).

40139381 is a wasteful number, since it uses less digits than its factorization.

40139381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25555.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 40139381 is about 6335.5647735620. The cubic root of 40139381 is about 342.3919591026.

The spelling of 40139381 in words is "forty million, one hundred thirty-nine thousand, three hundred eighty-one".