40155394 has 12 divisors (see below), whose sum is σ = 63985554. Its totient is φ = 18896384.

The previous prime is 40155389. The next prime is 40155403. The reversal of 40155394 is 49355104.

It can be written as a sum of positive squares in 3 ways, for example, as 40005625 + 149769 = 6325^2 + 387^2 .

It is a super-2 number, since 2×40155394² = 3224911334590472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34159 + ... + 35314.

Almost surely, 2^40155394 is an apocalyptic number.

40155394 is a deficient number, since it is larger than the sum of its proper divisors (23830160).

40155394 is a wasteful number, since it uses less digits than its factorization.

40155394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69509 (or 69492 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 40155394 is about 6336.8283865038. The cubic root of 40155394 is about 342.4374837501.

It can be divided in two parts, 4015 and 5394, that added together give a square (9409 = 97²).

The spelling of 40155394 in words is "forty million, one hundred fifty-five thousand, three hundred ninety-four".