400100742 has 16 divisors (see below), whose sum is σ = 889112880. Its totient is φ = 133366896.

The previous prime is 400100737. The next prime is 400100759. The reversal of 400100742 is 247001004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 3704583 + ... + 3704690.

It is an arithmetic number, because the mean of its divisors is an integer number (55569555).

Almost surely, 2^400100742 is an apocalyptic number.

400100742 is an abundant number, since it is smaller than the sum of its proper divisors (489012138).

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

400100742 is a wasteful number, since it uses less digits than its factorization.

400100742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7409284 (or 7409278 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 400100742 is about 20002.5183914426. The cubic root of 400100742 is about 736.8681506528.

Adding to 400100742 its reverse (247001004), we get a palindrome (647101746).

The spelling of 400100742 in words is "four hundred million, one hundred thousand, seven hundred forty-two".