400125551 has 8 divisors (see below), whose sum is σ = 465037440. Its totient is φ = 337151448.

The previous prime is 400125547. The next prime is 400125559. The reversal of 400125551 is 155521004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 400125551 - 2² = 400125547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400125559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484001 + ... + 484826.

It is an arithmetic number, because the mean of its divisors is an integer number (58129680).

Almost surely, 2^400125551 is an apocalyptic number.

400125551 is a deficient number, since it is larger than the sum of its proper divisors (64911889).

400125551 is an equidigital number, since it uses as much as digits as its factorization.

400125551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968893.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 400125551 is about 20003.1385287409. The cubic root of 400125551 is about 736.8833806371.

Adding to 400125551 its reverse (155521004), we get a palindrome (555646555).

The spelling of 400125551 in words is "four hundred million, one hundred twenty-five thousand, five hundred fifty-one".