19426402 has 4 divisors (see below), whose sum is σ = 29139606. Its totient is φ = 9713200.

The previous prime is 19426397. The next prime is 19426409. The reversal of 19426402 is 20462491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20462491 = 7 ⋅2923213.

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 772641 = 4319^2 + 879^2 .

It is not an unprimeable number, because it can be changed into a prime (19426409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4856599 + ... + 4856602.

Almost surely, 2^19426402 is an apocalyptic number.

19426402 is a deficient number, since it is larger than the sum of its proper divisors (9713204).

19426402 is an equidigital number, since it uses as much as digits as its factorization.

19426402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9713203.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 19426402 is about 4407.5392227410. The cubic root of 19426402 is about 268.8215766085.

Adding to 19426402 its reverse (20462491), we get a palindrome (39888893).

The spelling of 19426402 in words is "nineteen million, four hundred twenty-six thousand, four hundred two".