400155501 has 8 divisors (see below), whose sum is σ = 533674240. Its totient is φ = 266703552.

The previous prime is 400155493. The next prime is 400155517. The reversal of 400155501 is 105551004.

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

It is not a de Polignac number, because 400155501 - 2³ = 400155493 is a prime.

It is a super-2 number, since 2×400155501² = 320248849961122002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400155551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460 + ... + 28293.

It is an arithmetic number, because the mean of its divisors is an integer number (66709280).

Almost surely, 2^400155501 is an apocalyptic number.

It is an amenable number.

400155501 is a deficient number, since it is larger than the sum of its proper divisors (133518739).

400155501 is a wasteful number, since it uses less digits than its factorization.

400155501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33395.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 400155501 is about 20003.8871472522. The cubic root of 400155501 is about 736.9017657886.

The spelling of 400155501 in words is "four hundred million, one hundred fifty-five thousand, five hundred one".