1561402 has 8 divisors (see below), whose sum is σ = 2350656. Its totient is φ = 777852.

The previous prime is 1561393. The next prime is 1561421. The reversal of 1561402 is 2041651.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1561402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658 + ... + 1885.

It is an arithmetic number, because the mean of its divisors is an integer number (293832).

2^1561402 is an apocalyptic number.

1561402 is a deficient number, since it is larger than the sum of its proper divisors (789254).

1561402 is a wasteful number, since it uses less digits than its factorization.

1561402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1561402 is about 1249.5607228142. The cubic root of 1561402 is about 116.0125333267.

Subtracting 1561402 from its reverse (2041651), we obtain a square (480249 = 693²).

The spelling of 1561402 in words is "one million, five hundred sixty-one thousand, four hundred two".