1625981 has 16 divisors (see below), whose sum is σ = 1966080. Its totient is φ = 1315440.

The previous prime is 1625977. The next prime is 1625989. The reversal of 1625981 is 1895261.

It is not a de Polignac number, because 1625981 - 2² = 1625977 is a prime.

It is a super-2 number, since 2×1625981² = 5287628424722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625989) 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, 12740 + ... + 12866.

It is an arithmetic number, because the mean of its divisors is an integer number (122880).

2^1625981 is an apocalyptic number.

It is an amenable number.

1625981 is a deficient number, since it is larger than the sum of its proper divisors (340099).

1625981 is a wasteful number, since it uses less digits than its factorization.

1625981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224.

The product of its digits is 4320, while the sum is 32.

The square root of 1625981 is about 1275.1396002007. The cubic root of 1625981 is about 117.5903876713.

The spelling of 1625981 in words is "one million, six hundred twenty-five thousand, nine hundred eighty-one".