1213987950 has 72 divisors (see below), whose sum is σ = 3727530768. Its totient is φ = 277482240.

The previous prime is 1213987939. The next prime is 1213987967. The reversal of 1213987950 is 597893121.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1213987896 and 1213987905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 189547 + ... + 195846.

Almost surely, 2^1213987950 is an apocalyptic number.

1213987950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213987950 is an abundant number, since it is smaller than the sum of its proper divisors (2513542818).

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

1213987950 is a wasteful number, since it uses less digits than its factorization.

1213987950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385418 (or 385410 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1213987950 is about 34842.3298589517. The cubic root of 1213987950 is about 1066.7716330080.

The spelling of 1213987950 in words is "one billion, two hundred thirteen million, nine hundred eighty-seven thousand, nine hundred fifty".