1251642 has 32 divisors (see below), whose sum is σ = 3030912. Its totient is φ = 336384.

The previous prime is 1251641. The next prime is 1251661. The reversal of 1251642 is 2461521.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1251641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163 + ... + 1590.

It is an arithmetic number, because the mean of its divisors is an integer number (94716).

2^1251642 is an apocalyptic number.

1251642 is an abundant number, since it is smaller than the sum of its proper divisors (1779270).

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

1251642 is a wasteful number, since it uses less digits than its factorization.

1251642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its digits is 480, while the sum is 21.

The square root of 1251642 is about 1118.7680724797. The cubic root of 1251642 is about 107.7688816203.

The spelling of 1251642 in words is "one million, two hundred fifty-one thousand, six hundred forty-two".