393977742 has 16 divisors (see below), whose sum is σ = 788261760. Its totient is φ = 131274872.

The previous prime is 393977713. The next prime is 393977761. The reversal of 393977742 is 247779393.

It is a super-2 number, since 2×393977742² = 310436922382837128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6109 + ... + 28727.

It is an arithmetic number, because the mean of its divisors is an integer number (49266360).

Almost surely, 2^393977742 is an apocalyptic number.

393977742 is an abundant number, since it is smaller than the sum of its proper divisors (394284018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393977742 is a wasteful number, since it uses less digits than its factorization.

393977742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25527.

The product of its digits is 2000376, while the sum is 51.

The square root of 393977742 is about 19848.8725624404. The cubic root of 393977742 is about 733.0898878330.

The spelling of 393977742 in words is "three hundred ninety-three million, nine hundred seventy-seven thousand, seven hundred forty-two".