1402400121 has 16 divisors (see below), whose sum is σ = 1938565440. Its totient is φ = 901134080.

The previous prime is 1402400117. The next prime is 1402400143. The reversal of 1402400121 is 1210042041.

It is not a de Polignac number, because 1402400121 - 2² = 1402400117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1402400121.

It is not an unprimeable number, because it can be changed into a prime (1402400161) 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 15 ways as a sum of consecutive naturals, for example, 58476 + ... + 78893.

It is an arithmetic number, because the mean of its divisors is an integer number (121160340).

Almost surely, 2^1402400121 is an apocalyptic number.

It is an amenable number.

1402400121 is a deficient number, since it is larger than the sum of its proper divisors (536165319).

1402400121 is a wasteful number, since it uses less digits than its factorization.

1402400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137496.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1402400121 is about 37448.6330992201. The cubic root of 1402400121 is about 1119.3278601589.

Adding to 1402400121 its reverse (1210042041), we get a palindrome (2612442162).

The spelling of 1402400121 in words is "one billion, four hundred two million, four hundred thousand, one hundred twenty-one".