19925139 has 32 divisors (see below), whose sum is σ = 31074624. Its totient is φ = 11243520.

The previous prime is 19925137. The next prime is 19925141. The reversal of 19925139 is 93152991.

It is an interprime number because it is at equal distance from previous prime (19925137) and next prime (19925141).

It is not a de Polignac number, because 19925139 - 2¹ = 19925137 is a prime.

It is a super-2 number, since 2×19925139² = 794022328338642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 19925097 and 19925106.

It is not an unprimeable number, because it can be changed into a prime (19925137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26817 + ... + 27549.

It is an arithmetic number, because the mean of its divisors is an integer number (971082).

Almost surely, 2^19925139 is an apocalyptic number.

19925139 is a deficient number, since it is larger than the sum of its proper divisors (11149485).

19925139 is a wasteful number, since it uses less digits than its factorization.

19925139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807.

The product of its digits is 21870, while the sum is 39.

The square root of 19925139 is about 4463.7583939994. The cubic root of 19925139 is about 271.1026648595.

The spelling of 19925139 in words is "nineteen million, nine hundred twenty-five thousand, one hundred thirty-nine".