19402240 has 160 divisors (see below), whose sum is σ = 55683936. Its totient is φ = 6389760.

The previous prime is 19402237. The next prime is 19402283. The reversal of 19402240 is 4220491.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366054 + ... + 366106.

Almost surely, 2^19402240 is an apocalyptic number.

19402240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27841968).

19402240 is an abundant number, since it is smaller than the sum of its proper divisors (36281696).

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

19402240 is a wasteful number, since it uses less digits than its factorization.

19402240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 19402240 is about 4404.7973846705. The cubic root of 19402240 is about 268.7100795220.

The spelling of 19402240 in words is "nineteen million, four hundred two thousand, two hundred forty".