400951591 has 4 divisors (see below), whose sum is σ = 401098752. Its totient is φ = 400804432.

The previous prime is 400951561. The next prime is 400951633. The reversal of 400951591 is 195159004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 400951591 - 2¹³ = 400943399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400951531) 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, 69415 + ... + 74968.

It is an arithmetic number, because the mean of its divisors is an integer number (100274688).

Almost surely, 2^400951591 is an apocalyptic number.

400951591 is a deficient number, since it is larger than the sum of its proper divisors (147161).

400951591 is a wasteful number, since it uses less digits than its factorization.

400951591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147160.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 400951591 is about 20023.7756429700. The cubic root of 400951591 is about 737.3901188780.

The spelling of 400951591 in words is "four hundred million, nine hundred fifty-one thousand, five hundred ninety-one".