400013442 has 24 divisors (see below), whose sum is σ = 868301616. Its totient is φ = 133090776.

The previous prime is 400013423. The next prime is 400013461. The reversal of 400013442 is 244310004.

It is an interprime number because it is at equal distance from previous prime (400013423) and next prime (400013461).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10468 + ... + 30159.

It is an arithmetic number, because the mean of its divisors is an integer number (36179234).

Almost surely, 2^400013442 is an apocalyptic number.

400013442 is an abundant number, since it is smaller than the sum of its proper divisors (468288174).

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

400013442 is a wasteful number, since it uses less digits than its factorization.

400013442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41182 (or 41179 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 400013442 is about 20000.3360471768. The cubic root of 400013442 is about 736.8145530942.

Adding to 400013442 its reverse (244310004), we get a palindrome (644323446).

The spelling of 400013442 in words is "four hundred million, thirteen thousand, four hundred forty-two".