123749690 has 32 divisors (see below), whose sum is σ = 227238480. Its totient is φ = 48513024.

The previous prime is 123749677. The next prime is 123749693. The reversal of 123749690 is 96947321.

It can be written as a sum of positive squares in 8 ways, for example, as 1713481 + 122036209 = 1309^2 + 11047^2 .

It is a super-2 number, since 2×123749690² = 30627971550192200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (123749693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109046 + ... + 110174.

Almost surely, 2^123749690 is an apocalyptic number.

123749690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123749690 is a deficient number, since it is larger than the sum of its proper divisors (103488790).

123749690 is a wasteful number, since it uses less digits than its factorization.

123749690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 123749690 is about 11124.2837971709. The cubic root of 123749690 is about 498.3273305939.

The spelling of 123749690 in words is "one hundred twenty-three million, seven hundred forty-nine thousand, six hundred ninety".