19157420 has 12 divisors (see below), whose sum is σ = 40230624. Its totient is φ = 7662960.

The previous prime is 19157417. The next prime is 19157423. The reversal of 19157420 is 2475191.

It is an interprime number because it is at equal distance from previous prime (19157417) and next prime (19157423).

It is not an unprimeable number, because it can be changed into a prime (19157423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478916 + ... + 478955.

It is an arithmetic number, because the mean of its divisors is an integer number (3352552).

Almost surely, 2^19157420 is an apocalyptic number.

19157420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19157420 is an abundant number, since it is smaller than the sum of its proper divisors (21073204).

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

19157420 is a wasteful number, since it uses less digits than its factorization.

19157420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957880 (or 957878 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 19157420 is about 4376.9190077039. The cubic root of 19157420 is about 267.5750859180.

The spelling of 19157420 in words is "nineteen million, one hundred fifty-seven thousand, four hundred twenty".