1901181940 has 24 divisors (see below), whose sum is σ = 4562836992. Its totient is φ = 651833760.

The previous prime is 1901181929. The next prime is 1901181949. The reversal of 1901181940 is 491811091.

It is a super-2 number, since 2×1901181940² = 7228985537964327200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1901181896 and 1901181905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901181949) 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, 6789796 + ... + 6790075.

It is an arithmetic number, because the mean of its divisors is an integer number (190118208).

Almost surely, 2^1901181940 is an apocalyptic number.

1901181940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1901181940 is an abundant number, since it is smaller than the sum of its proper divisors (2661655052).

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

1901181940 is a wasteful number, since it uses less digits than its factorization.

1901181940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13579887 (or 13579885 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 1901181940 is about 43602.5451092021. The cubic root of 1901181940 is about 1238.8191020709.

The spelling of 1901181940 in words is "one billion, nine hundred one million, one hundred eighty-one thousand, nine hundred forty".