1251401404 has 12 divisors (see below), whose sum is σ = 2389039128. Its totient is φ = 568818800.

The previous prime is 1251401401. The next prime is 1251401407. The reversal of 1251401404 is 4041041521.

It is an interprime number because it is at equal distance from previous prime (1251401401) and next prime (1251401407).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251401401) 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, 14220427 + ... + 14220514.

It is an arithmetic number, because the mean of its divisors is an integer number (199086594).

Almost surely, 2^1251401404 is an apocalyptic number.

It is an amenable number.

1251401404 is a deficient number, since it is larger than the sum of its proper divisors (1137637724).

1251401404 is a wasteful number, since it uses less digits than its factorization.

1251401404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28440956 (or 28440954 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1251401404 is about 35375.1523530288. The cubic root of 1251401404 is about 1077.6197591204.

Adding to 1251401404 its reverse (4041041521), we get a palindrome (5292442925).

The spelling of 1251401404 in words is "one billion, two hundred fifty-one million, four hundred one thousand, four hundred four".