19420457 has 8 divisors (see below), whose sum is σ = 22309056. Its totient is φ = 16560432.

The previous prime is 19420439. The next prime is 19420501. The reversal of 19420457 is 75402491.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19420457 - 2⁸ = 19420201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19420657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5663 + ... + 8420.

It is an arithmetic number, because the mean of its divisors is an integer number (2788632).

Almost surely, 2^19420457 is an apocalyptic number.

It is an amenable number.

19420457 is a deficient number, since it is larger than the sum of its proper divisors (2888599).

19420457 is a wasteful number, since it uses less digits than its factorization.

19420457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14287.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 19420457 is about 4406.8647585330. The cubic root of 19420457 is about 268.7941516068.

The spelling of 19420457 in words is "nineteen million, four hundred twenty thousand, four hundred fifty-seven".