400505542 has 4 divisors (see below), whose sum is σ = 600758316. Its totient is φ = 200252770.

The previous prime is 400505537. The next prime is 400505557. The reversal of 400505542 is 245505004.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100126384 + ... + 100126387.

It is an arithmetic number, because the mean of its divisors is an integer number (150189579).

Almost surely, 2^400505542 is an apocalyptic number.

400505542 is a deficient number, since it is larger than the sum of its proper divisors (200252774).

400505542 is a wasteful number, since it uses less digits than its factorization.

400505542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200252773.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 400505542 is about 20012.6345591978. The cubic root of 400505542 is about 737.1165744926.

The spelling of 400505542 in words is "four hundred million, five hundred five thousand, five hundred forty-two".