400012401997 has 4 divisors (see below), whose sum is σ = 430782586780. Its totient is φ = 369242217216.

The previous prime is 400012401973. The next prime is 400012402007. The reversal of 400012401997 is 799104210004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 128494288521 + 271518113476 = 358461^2 + 521074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400012401997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400012408997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15385092372 + ... + 15385092397.

It is an arithmetic number, because the mean of its divisors is an integer number (107695646695).

Almost surely, 2^400012401997 is an apocalyptic number.

It is an amenable number.

400012401997 is a deficient number, since it is larger than the sum of its proper divisors (30770184783).

400012401997 is a wasteful number, since it uses less digits than its factorization.

400012401997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30770184782.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 400012401997 in words is "four hundred billion, twelve million, four hundred one thousand, nine hundred ninety-seven".