1919901240 has 48 divisors (see below), whose sum is σ = 6239680200. Its totient is φ = 511973568.

The previous prime is 1919901233. The next prime is 1919901253. The reversal of 1919901240 is 421099191.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1919901195 and 1919901204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2666170 + ... + 2666889.

Almost surely, 2^1919901240 is an apocalyptic number.

1919901240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1919901240 is an abundant number, since it is smaller than the sum of its proper divisors (4319778960).

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

1919901240 is a wasteful number, since it uses less digits than its factorization.

1919901240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5333076 (or 5333069 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1919901240 is about 43816.6776467591. The cubic root of 1919901240 is about 1242.8716915799.

The spelling of 1919901240 in words is "one billion, nine hundred nineteen million, nine hundred one thousand, two hundred forty".