1393981900 has 36 divisors (see below), whose sum is σ = 3070103848. Its totient is φ = 549267840.

The previous prime is 1393981891. The next prime is 1393981909. The reversal of 1393981900 is 91893931.

It is an interprime number because it is at equal distance from previous prime (1393981891) and next prime (1393981909).

It is a super-2 number, since 2×1393981900² = 3886371075055220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1393981909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97329 + ... + 110728.

Almost surely, 2^1393981900 is an apocalyptic number.

1393981900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1393981900 is an abundant number, since it is smaller than the sum of its proper divisors (1676121948).

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

1393981900 is a wasteful number, since it uses less digits than its factorization.

1393981900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208138 (or 208131 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1393981900 is about 37336.0670130104. The cubic root of 1393981900 is about 1117.0836916700.

The spelling of 1393981900 in words is "one billion, three hundred ninety-three million, nine hundred eighty-one thousand, nine hundred".