400022542 has 16 divisors (see below), whose sum is σ = 637752960. Its totient is φ = 187642872.

The previous prime is 400022533. The next prime is 400022551. The reversal of 400022542 is 245220004.

It is an interprime number because it is at equal distance from previous prime (400022533) and next prime (400022551).

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 47188 + ... + 55015.

It is an arithmetic number, because the mean of its divisors is an integer number (39859560).

Almost surely, 2^400022542 is an apocalyptic number.

400022542 is a deficient number, since it is larger than the sum of its proper divisors (237730418).

400022542 is a wasteful number, since it uses less digits than its factorization.

400022542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102327.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 400022542 is about 20000.5635420605. The cubic root of 400022542 is about 736.8201403744.

Adding to 400022542 its reverse (245220004), we get a palindrome (645242546).

The spelling of 400022542 in words is "four hundred million, twenty-two thousand, five hundred forty-two".