400140197 has 6 divisors (see below), whose sum is σ = 410139474. Its totient is φ = 390379040.

The previous prime is 400140161. The next prime is 400140211. The reversal of 400140197 is 791041004.

It can be written as a sum of positive squares in 3 ways, for example, as 48427681 + 351712516 = 6959^2 + 18754^2 .

It is not a de Polignac number, because 400140197 - 2²⁶ = 333031333 is a prime.

It is a super-2 number, since 2×400140197² = 320224354510397618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400140137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117338 + ... + 120699.

It is an arithmetic number, because the mean of its divisors is an integer number (68356579).

Almost surely, 2^400140197 is an apocalyptic number.

It is an amenable number.

400140197 is a deficient number, since it is larger than the sum of its proper divisors (9999277).

400140197 is an equidigital number, since it uses as much as digits as its factorization.

400140197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238119 (or 238078 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 400140197 is about 20003.5046179413. The cubic root of 400140197 is about 736.8923713670.

The spelling of 400140197 in words is "four hundred million, one hundred forty thousand, one hundred ninety-seven".