1390402 has 16 divisors (see below), whose sum is σ = 2290680. Its totient is φ = 628992.

The previous prime is 1390399. The next prime is 1390409. The reversal of 1390402 is 2040931.

It can be written as a sum of positive squares in 4 ways, for example, as 982081 + 408321 = 991^2 + 639^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1390402.

It is not an unprimeable number, because it can be changed into a prime (1390409) 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, 874 + ... + 1882.

2^1390402 is an apocalyptic number.

1390402 is a deficient number, since it is larger than the sum of its proper divisors (900278).

1390402 is a wasteful number, since it uses less digits than its factorization.

1390402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1390402 is about 1179.1530859053. The cubic root of 1390402 is about 111.6126606997.

The spelling of 1390402 in words is "one million, three hundred ninety thousand, four hundred two".