19651995 has 72 divisors (see below), whose sum is σ = 39508560. Its totient is φ = 8951040.

The previous prime is 19651987. The next prime is 19651999. The reversal of 19651995 is 59915691.

It is a happy number.

It is not a de Polignac number, because 19651995 - 2³ = 19651987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19651995.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19651999) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 531117 + ... + 531153.

It is an arithmetic number, because the mean of its divisors is an integer number (548730).

Almost surely, 2^19651995 is an apocalyptic number.

19651995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19651995 is an abundant number, since it is smaller than the sum of its proper divisors (19856565).

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

19651995 is a wasteful number, since it uses less digits than its factorization.

19651995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 85 counting only the distinct ones).

The product of its digits is 109350, while the sum is 45.

The square root of 19651995 is about 4433.0570715929. The cubic root of 19651995 is about 269.8581559482.

The spelling of 19651995 in words is "nineteen million, six hundred fifty-one thousand, nine hundred ninety-five".