405743979 has 4 divisors (see below), whose sum is σ = 540991976. Its totient is φ = 270495984.

The previous prime is 405743971. The next prime is 405743983. The reversal of 405743979 is 979347504.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 405743979 - 2³ = 405743971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405743971) 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, 67623994 + ... + 67623999.

It is an arithmetic number, because the mean of its divisors is an integer number (135247994).

Almost surely, 2^405743979 is an apocalyptic number.

405743979 is a deficient number, since it is larger than the sum of its proper divisors (135247997).

405743979 is a wasteful number, since it uses less digits than its factorization.

405743979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135247996.

The product of its (nonzero) digits is 952560, while the sum is 48.

The square root of 405743979 is about 20143.0876233014. The cubic root of 405743979 is about 740.3163846774.

The spelling of 405743979 in words is "four hundred five million, seven hundred forty-three thousand, nine hundred seventy-nine".