400017397 has 32 divisors (see below), whose sum is σ = 462371840. Its totient is φ = 343388160.

The previous prime is 400017313. The next prime is 400017413. The reversal of 400017397 is 793710004.

It is a cyclic number.

It is not a de Polignac number, because 400017397 - 2²⁷ = 265799669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400017307) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2072533 + ... + 2072725.

It is an arithmetic number, because the mean of its divisors is an integer number (14449120).

Almost surely, 2^400017397 is an apocalyptic number.

It is an amenable number.

400017397 is a deficient number, since it is larger than the sum of its proper divisors (62354443).

400017397 is a wasteful number, since it uses less digits than its factorization.

400017397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 400017397 is about 20000.4349202711. The cubic root of 400017397 is about 736.8169814226.

The spelling of 400017397 in words is "four hundred million, seventeen thousand, three hundred ninety-seven".