1309402 has 4 divisors (see below), whose sum is σ = 1964106. Its totient is φ = 654700.

The previous prime is 1309397. The next prime is 1309411. The reversal of 1309402 is 2049031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2049031 = 271 ⋅7561.

It can be written as a sum of positive squares in only one way, i.e., 1164241 + 145161 = 1079^2 + 381^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1309402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327349 + ... + 327352.

2^1309402 is an apocalyptic number.

1309402 is a deficient number, since it is larger than the sum of its proper divisors (654704).

1309402 is an equidigital number, since it uses as much as digits as its factorization.

1309402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654703.

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

The square root of 1309402 is about 1144.2910468932. The cubic root of 1309402 is about 109.4017661840.

It can be divided in two parts, 1309 and 402, that added together give a triangular number (1711 = T₅₈).

The spelling of 1309402 in words is "one million, three hundred nine thousand, four hundred two".