400400036402 has 8 divisors (see below), whose sum is σ = 605915099676. Its totient is φ = 198428336512.

The previous prime is 400400036381. The next prime is 400400036441. The reversal of 400400036402 is 204630004004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 387918454561 + 12481581841 = 622831^2 + 111721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885840563 + ... + 885841014.

Almost surely, 2^400400036402 is an apocalyptic number.

400400036402 is a deficient number, since it is larger than the sum of its proper divisors (205515063274).

400400036402 is a wasteful number, since it uses less digits than its factorization.

400400036402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771681692.

The product of its (nonzero) digits is 2304, while the sum is 23.

The spelling of 400400036402 in words is "four hundred billion, four hundred million, thirty-six thousand, four hundred two".