40399977 has 4 divisors (see below), whose sum is σ = 53866640. Its totient is φ = 26933316.

The previous prime is 40399969. The next prime is 40399979. The reversal of 40399977 is 77999304.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40399977 - 2³ = 40399969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40399979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6733327 + ... + 6733332.

It is an arithmetic number, because the mean of its divisors is an integer number (13466660).

Almost surely, 2^40399977 is an apocalyptic number.

It is an amenable number.

40399977 is a deficient number, since it is larger than the sum of its proper divisors (13466663).

40399977 is a wasteful number, since it uses less digits than its factorization.

40399977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466662.

The product of its (nonzero) digits is 428652, while the sum is 48.

The square root of 40399977 is about 6356.0976235423. The cubic root of 40399977 is about 343.1313292086.

The spelling of 40399977 in words is "forty million, three hundred ninety-nine thousand, nine hundred seventy-seven".