405373978 has 4 divisors (see below), whose sum is σ = 608060970. Its totient is φ = 202686988.

The previous prime is 405373957. The next prime is 405373999. The reversal of 405373978 is 879373504.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (405373957) and next prime (405373999).

It can be written as a sum of positive squares in only one way, i.e., 397882809 + 7491169 = 19947^2 + 2737^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101343493 + ... + 101343496.

Almost surely, 2^405373978 is an apocalyptic number.

405373978 is a deficient number, since it is larger than the sum of its proper divisors (202686992).

405373978 is a wasteful number, since it uses less digits than its factorization.

405373978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202686991.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 405373978 is about 20133.9012116380. The cubic root of 405373978 is about 740.0912828713.

It can be divided in two parts, 405373 and 978, that added together give a triangular number (406351 = T₉₀₁).

The spelling of 405373978 in words is "four hundred five million, three hundred seventy-three thousand, nine hundred seventy-eight".