1581402 has 8 divisors (see below), whose sum is σ = 3162816. Its totient is φ = 527132.

The previous prime is 1581379. The next prime is 1581413. The reversal of 1581402 is 2041851.

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

1581402 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131778 + ... + 131789.

It is an arithmetic number, because the mean of its divisors is an integer number (395352).

2^1581402 is an apocalyptic number.

1581402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1581402 is a wasteful number, since it uses less digits than its factorization.

1581402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263572.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1581402 is about 1257.5380709943. The cubic root of 1581402 is about 116.5057682249.

The spelling of 1581402 in words is "one million, five hundred eighty-one thousand, four hundred two".