405403942 has 4 divisors (see below), whose sum is σ = 608105916. Its totient is φ = 202701970.

The previous prime is 405403937. The next prime is 405403951. The reversal of 405403942 is 249304504.

It is a happy number.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101350984 + ... + 101350987.

It is an arithmetic number, because the mean of its divisors is an integer number (152026479).

Almost surely, 2^405403942 is an apocalyptic number.

405403942 is a deficient number, since it is larger than the sum of its proper divisors (202701974).

405403942 is a wasteful number, since it uses less digits than its factorization.

405403942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202701973.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 405403942 is about 20134.6453159722. The cubic root of 405403942 is about 740.1095175139.

The spelling of 405403942 in words is "four hundred five million, four hundred three thousand, nine hundred forty-two".